Test: Code Generation & Optimization- 2


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15 Questions MCQ Test GATE Computer Science Engineering(CSE) 2023 Mock Test Series | Test: Code Generation & Optimization- 2

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Test: Code Generation & Optimization- 2 - Question 1

In some phase of compiler 

Input
temp1 := Inttoreal (60)
temp2 := id3 * temp1 
temp3 := id2 + temp2
id1 := temp3
Output
temp 1 := id3 * 60.0
id1 := id2 + temp1

where temp 1 , temp 2 , temp 3 are temporary storage, id1, id2, Id3 are identifier into real is converting int 60 to real number. The above phase is

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 1

Input:
temp1: = inttoreal(60)
temp2: = id3*temp1
temp3 : = id2 + temp2
id1 : = temp3

Output:
temp1 : = id3*60.0
id1 : id2 + temp1

The above phase is code optimization, because it is optimizing the intermediate code using only storages as temp 1 and id1.

Test: Code Generation & Optimization- 2 - Question 2

 The DAG shown here represents

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 2

The above DAG represents
(a + b * C ) * { b * C - d )

Test: Code Generation & Optimization- 2 - Question 3

Any Directed Acyclic Graph must have

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 3

Simplest DAG:

Test: Code Generation & Optimization- 2 - Question 4

The DAG shown here represents:

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 4

Simplifying the DAG:

Thus result: (a + b) * (c + cf) + (a - b) * (c + d)

Test: Code Generation & Optimization- 2 - Question 5

 Consider the DAG with V = {1, 2, 3, 4, 5, 6}, shown below

Which of the following is NOT a topological ordering

Test: Code Generation & Optimization- 2 - Question 6

A directed acyclic graph represents one form of intermediate representation. The number of non terminals nodes in DAG of a = (b + c)*(b + c) expression is

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 6

Since indegree of node 3 is 1. So cannot start topological ordering with node 3 only start node will be 1.

Test: Code Generation & Optimization- 2 - Question 7

A pictorial representation of the value computed by each statement in the basic block is

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 7

A pictorial representation of the value computed by. each statement in the basic block is control flow graph.

Test: Code Generation & Optimization- 2 - Question 8

DAG representation of a basic block allows

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 8

DAG representation of a basic block allows automatic detection of local common sub expression.

Test: Code Generation & Optimization- 2 - Question 9

The intermediate code generated for the following syntax tree is:

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 9

The intermediate code generated is iacb + cd uminus * - +

Test: Code Generation & Optimization- 2 - Question 10

The triple representation for following representation is: 

Test: Code Generation & Optimization- 2 - Question 11

Generation of intermediate code based on an abstract machine model is useful in compilers because

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 11

Intermediate code enhance the portability of the front end of the compiler.

Test: Code Generation & Optimization- 2 - Question 12

Three address code’ technique for intermediate code generation shows that each statement usually contains three addresses. Three addresses are as follows:

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 12

Three address code formate is two addresses for operands and one for operator.

Test: Code Generation & Optimization- 2 - Question 13

Consider the following arithmetic infix expression Q.

Transform 'Q' into its equivalent postfix expression.

Detailed Solution for Test: Code Generation & Optimization- 2 - Question 13

Given expression

Equivalent postfix expression;

Test: Code Generation & Optimization- 2 - Question 14

Which of the following is not a type of three address statements?

Test: Code Generation & Optimization- 2 - Question 15

Consider the following statements:
S1: Three address code is a linearized representation of a syntax tree.
S2: The syntax tree not depicts the natural hierarchical structure of source program

Which of the above statements is/are true

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